6 Common Causes and Fixes for Gemini Image Model “required oneof field data” Error
title: "Gemini Image Model 'required oneof field data' 400 Error: 6 Common Causes and Fixes" date: 2024-12-25 description: "Learn how to fix the 'required oneof field data' 400 error when calling Gemini image models like gemini-3.1-flash-image-preview." tags: ["Gemini", "Google AI", "API Error", "Image Generation", "Multimodal AI", "Troubleshooting"] When calling gemini-3.1-flash-image-preview (Nano Banana 2) or gemini-3.0-pro-image…
